The harmonica, also called harp, French harp, blues harp, and mouth organ, is a free reed wind instrument used primarily in blues and American folk music, jazz, country, and rock and roll. It is played by blowing air into it or drawing air out by placing lips over individual holes (reed chambers) or multiple holes. The pressure caused by blowing or drawing air into the reed chambers causes a reed or multiple reeds to vibrate creating sound. Each chamber has multiple, variable-tuned brass or bronze reeds, which are secured at one end only, leaving the other free to vibrate.
Reeds are pre-tuned to individual tones, and each tone is determined according to the size of reed. Longer reeds make deep, low sounds and short reeds make higher-pitched sounds. On certain types of harmonica the pre-tuned reed can be changed (bending a note) to another note by redirecting air flow into the chamber. There are many types of harmonicas, including diatonic, chromatic, tremolo, orchestral, and bass versions.
Shortly after Hohner began manufacturing harmonicas in 1857, he shipped some to relatives who had emigrated to the United States. Its music rapidly became popular, and the country became an enormous market for Hohner's goods. President Abraham Lincoln carried a harmonica in his pocket, and harmonicas provided solace to soldiers on both the Union and Confederate sides of the American Civil War. Frontiersmen Wyatt Earp and Billy the Kid played the instrument, and it became a fixture of the American musical landscape.
A young harmonicist named Marion "Little Walter" Jacobs revolutionized the instrument by playing the harmonica with a microphone (typically a "Bullet" microphone marketed for use by radio taxi dispatchers cupped in his hands with the harmonica, giving it a "punchy" mid-range sound that can be heard above radio static, or an electric guitar). He cupped his hands around the instrument, tightening the air around the harp, giving it a powerful, distorted sound, somewhat reminiscent of a saxophone.
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